Those red screens are always a little dim. Good, bright red screens seem hard, or impossible to get. Im not sure its a good idea to run it without that resistor though? But im sure Olivier can confirm if that is ok or not.

I haven’t found a red OLED yet, but I haven’t exactly looked actively at OLEDs for a month or so. The white Reichelt (Electronic Assembly EA W162-X3LW) plus some red plexi on top will have to suffice for now.